Star Fox Zero amiibo features

Scanning a Fox amiibo swaps Fox and his teammates over to Retro
Arwings, fun throwback models based on the original Arwing featured on
the Super Nintendo Entertainment System™.

Scanning a Falco amiibo swaps Fox over to the Black Arwing. This sleek
starship has increased firepower and can lock on to two targets at
once, but receives more damage than the normal Arwing when hit.

Star Fox Guard

Need a little extra firepower? Tap the amiibo symbol in the top-left
corner of the Wii U GamePad controller while setting up your defenses,
then scan a Fox or Falco amiibo™ figure. Once the team's set, you can
call in the cavalry by tapping the Arwing symbol during the mission.

Note: there are certain missions where this feature can't be used. In
addition, you can only use this feature once per day, per compatible
amiibo character.